Hi Dieter,
On Fri, Apr 17, 2009 at 12:25:17PM +0200, Dieter Spaar wrote:
Another problem is that changing the calibration
requires a restart of
the BS-11 (at least I only saw any effect when I restarted). Additionally
when you query the calibration, you get the "PLL Set Value" and the
"PLL Work Value", the "Set Value" seems to be used when starting up
and the "Work Value" changes, most certainly locking to an external
clock also influences it. I did not find anything in the documentation,
actually those settings are not indended for the end user, just the
factory.
I would assume that you could just provide an accurate E1 clock to the BS-11,
then read the 'work value' and set the 'set value' to the value you have
obtained.
At least that would be my solution if I was designing a BTS and had to
implement a solution for the calibration...
Might be worth some experimentation.
Regards.
--
- Harald Welte <laforge(a)gnumonks.org>
http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)